world

Definition

Appears mostly in "world model": an internal, learned simulator of how an environment evolves under actions. Having one lets an agent plan by imagining rollouts instead of paying for real trials, which is why the idea recurs in reinforcement learning, robotics, and video generation. A second sense shows up in open-world, meaning the set of situations or categories is not fixed in advance.

Explainers using this term

• Paper Explained: Holi-World — Turning First-Person Recordings into a Ledger of the Room, Then Teaching a VLM to Reason over ItHoli-World: Building Holistic World Intelligence from Human-Ego Experience
• Paper Walkthrough: PointWAM — Forecasting the Scene and the Hands as 3D Point Trajectories to Teach Robot Hands from Human VideoPointWAM: 3D World Action Modeling for Dexterous Robotic Manipulation
• Paper Explained: WorldCrafter — A Video World Model That Remembers What You Saw, via Camera-Queryable MemoryWorldCrafter: Consistent Video World Model with Implicit 3D-aware Memory